Louis Braille developed a system for visually challenged persons and published it in
1921
1830
1821
1840
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Braille (/ˈbreɪl/ BRAYL; Braille: ⠃⠗⠇; French: [bʁaj]) is a tactile writing system used by people who are visually impaired. ... He published his system, which subsequently included musical notation, in 1829. The second revision, published in 1837, was the first binary form of writing developed in the modern era.
Parent systems: Night writing > Early braille > ...
Child systems: French Braille; English Braille; ...
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1921
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